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Within the firearms community, the Drop In Auto Sear Keychain is surprisingly divisive.

The dangers of these "keychains" were highlighted in high-profile legal cases, most notably involving the AutoKeyCard

It works by catching the hammer as the bolt carrier moves backward and releasing it once the bolt is in battery, bypassing the semi-auto disconnector.

: It sits inside the receiver and trips the sear when the bolt closes, allowing continuous fire with a single trigger pull.

Disclaimer: This article is for informational purposes only and does not constitute legal advice. Firearms laws vary by state and change frequently. Always consult with a qualified attorney and verify with the ATF before possessing any item that could be construed as a machine gun part.

: A drop-in auto sear is a small component designed for an AR-15 that allows it to fire automatically without machining the receiver.

, any device that converts a weapon into a machine gun is itself considered a machine gun. Unregistered auto sears are generally illegal to possess or transfer. The "Keychain" and "Wall Hanger" Marketing Novelty Labels